I think your last sketch might work the best, leaves you more room to put bigger items in, plus I find I get more output to the cabin when I fire to the rear (though I run a ported box). I have a 2.0 cubic ft box in that same space between the wheel wells and I can shift it left or right about five or so inches and still be good, so I think you can fit two 1.2's back there. Hope this helps, the rebuild is looking amazing!
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